无法在OneToOneField上加载带有PK的模型夹具

Question

当为OneToOneField设置为主键的模型加载fixture时，Django无法设置父ID。 models.py：

from django.db import models


class Parent(models.Model):
    base_id = models.AutoField(primary_key=True)


class Child(Parent):
    base = models.OneToOneField(Parent,
                                parent_link=True,
                                primary_key=True,
                                related_name="child")

夹具：

[
{
    "pk": 1, 
    "model": "fiddle.parent", 
    "fields": {}
},
{
    "pk": 2, 
    "model": "fiddle.parent", 
    "fields": {}
},
{
    "pk": 3, 
    "model": "fiddle.parent", 
    "fields": {}
},
{
    "pk": 1, 
    "model": "fiddle.child", 
    "fields": {}
},
{
    "pk": 2, 
    "model": "fiddle.child", 
    "fields": {}
},
{
    "pk": 3, 
    "model": "fiddle.child", 
    "fields": {}
}
]

回溯：

Traceback (most recent call last):
File "./manage.py", line 10, in <module>
    execute_from_command_line(sys.argv)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/__init__.py", line 399, in execute_from_command_line
    utility.execute()
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/__init__.py", line 392, in execute
    self.fetch_command(subcommand).run_from_argv(self.argv)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/base.py", line 242, in run_from_argv
    self.execute(*args, **options.__dict__)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/base.py", line 285, in execute
    output = self.handle(*args, **options)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 55, in handle
    self.loaddata(fixture_labels)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 84, in loaddata
    self.load_label(fixture_label)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/management/commands/loaddata.py", line 140, in load_label
    obj.save(using=self.using)
File "/tmp/pkTest/lib/python2.7/site-packages/django/core/serializers/base.py", line 164, in save
    models.Model.save_base(self.object, using=using, raw=True)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/models/base.py", line 573, in save_base
    updated = self._save_table(raw, cls, force_insert, force_update, using, update_fields)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/models/base.py", line 654, in _save_table
    result = self._do_insert(cls._base_manager, using, fields, update_pk, raw)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/models/base.py", line 687, in _do_insert
    using=using, raw=raw)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/models/manager.py", line 232, in _insert
    return insert_query(self.model, objs, fields, **kwargs)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/models/query.py", line 1511, in insert_query
    return query.get_compiler(using=using).execute_sql(return_id)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/models/sql/compiler.py", line 898, in execute_sql
    cursor.execute(sql, params)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/backends/util.py", line 69, in execute
    return super(CursorDebugWrapper, self).execute(sql, params)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/utils.py", line 99, in __exit__
    six.reraise(dj_exc_type, dj_exc_value, traceback)
File "/tmp/pkTest/lib/python2.7/site-packages/django/db/backends/util.py", line 53, in execute
    return self.cursor.execute(sql, params)
django.db.utils.IntegrityError: Problem installing fixture '/tmp/pkTest/testPK/./db.json': Could not load fiddle.Child(pk=None): null value in column "base_id" violates not-null constraint
DETAIL:  Failing row contains (null).

我使用PostgreSQL作为数据库。任何想法如何解决这个问题？这是一个django bug吗？找不到有类似问题的人：（